...As you short the market, you have to be extremely alert incase there's a sudden movement by the market that'll make you to lose too much. When you see anything like that then you need to stop your trade and cut your losses short because if you leave the trade there, you might end up losing more than you expected. ..
Such an "unexpected" movement should not be a problem for a trader if he adheres to risk management. The easiest way to avoid liquidation is to set a stop loss. Setting a stop loss should be as mandatory as setting a take profit.